Radio Operator = person responsible for helicopter, personnel and freight logistics, lifeboat and emergency muster lists, T cards, preparing personnel on board lists and the onboard communications systems; a GMDSS Radio Operator's License is needed in most cases. Continued below

Refinery Engineer = Person who evaluates, plans and executes all the needs, facilities and processes at the refinery and works towards streamlining these aspects.

Reliability Engineer = Person who works alongside the other stakeholders in asset management and identifies the improvement opportunities, ensuring they are delivered.

Reservoir Engineer = person who studies the behavior and characteristics of a petroleum reservoir to determine the course of future development and production that will maximize the profit; in other words, this is a person who, after a throughout analysis of the size and shape of the reservoir, decides the most appropriate locations for the production wells to be drilled in order to get optimum recovery.

Reservoir Petrophysicist = Person who studies the specific physical properties of particular rock types; also, being involved with the field data from the well.

Roughneck = person working on the rig floor, and responsible for the machines and equipment that is used for the drilling operation; usually works in a group of three Roughnecks. The supervisor of the Roughneck is generally the Chief Driller.

Roustabout = person who is typically drilling on the oil rig; duties: unloading of equipment, servicing well units, supplying equipment to rig floor when required, keeping main deck and pipe deck tidy and clean and helping with the guidance of the crane as supply loads are moved to the rig deck.
Roustabouts work; also, ensures keeping the pipe deck and main deck tidy and clean and supervising the crane when the loads are being moved aboard.

ROV Operator = Person who operates the ROV system and equipment and responsible for all day-to-day operating activities on the ROV systems.

ROV Superintendent = Person who has overall responsibility for the ROV System and ensuring that the crew and support equipment is competent to undertake the necessary tasks.

ROV Technician = Person who repairs and maintains the electrical and electronic components of the ROV Systems and Equipment.

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